ANTH 1 Lecture Notes - Lecture 31: Biological Anthropology, Diaphysis, Senescence
19 Oct 2020
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Document Summary
Races are typically defined using polygenic traits, influenced by more than one gene and exhibiting a continuous range of expression. The difficulty is in drawing distinct boundaries between populations. Assumption: race as valid unit of biological studies. All modern humans belong to the same polytypic species, homo sapiens. Mechanism: gene flow over long period of time. A polytypic species consists of local populations that differ from on another in the expression of one or more traits. High degree of genetic variation in african populations, suggesting african origin of all humans. Evidence role of genetic drift in recent evolution. Suggest patterning of human variation at global level to identify genetic risk factors. Genetically, humans differ individually within populations far more than large geographical groups differ from on another. Pressure applied bones know they need to grow. Secular trend: assumption that growth pretention not met when food insecure.
